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      <title>SpringCloudConfig实现配置文件动态刷新 - 交互式测验</title>
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      </style>
    </head>
    <body>
      <div class="main-wrapper">
          <div class="quiz-container">
            <div class="quiz-header">
              <h1>SpringCloudConfig实现配置文件动态刷新 - 交互式测验</h1>
              <p>检验你对文档内容的理解程度</p>
            </div>
            <div id="quiz-content">
                <div class="quiz-body">
                    <div class="progress-bar">
                        <div id="progress-indicator"></div>
                    </div>
                    <div id="question-container">
                      <p id="question-text"></p>
                      <ul class="options-list" id="options-list"></ul>
                    </div>
                    <div id="result-container"></div>
                    <div id="hint-container" class="hint-container"></div>
                </div>
                <div class="quiz-footer" id="quiz-footer">
                  <button id="prev-btn" class="nav-btn">上一题</button>
                  <button id="hint-btn" class="nav-btn" style="background-color: #ffc107; color: #333; box-shadow: 0 4px 12px rgba(255,193,7,0.3);">提示</button>
                  <button id="next-btn" class="nav-btn">下一题</button>
                </div>
            </div>
          </div>
      </div>

      <script>
        const quizData = [
  {
    "question": "在 Spring Cloud Config 架构中，Config Server 和 Config Client 各自扮演什么核心角色？",
    "options": [
      "Config Server 是消费配置的微服务应用，Config Client 则是提供配置的服务中心。",
      "Config Server 负责集中管理和提供配置文件，而 Config Client 是消费这些配置的微服务应用。",
      "两者都负责存储配置，但 Config Server 用于生产环境，Config Client 用于开发环境。",
      "Config Server 负责监控配置变更，Config Client 负责执行配置变更的广播。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "文档明确定义了 Spring Cloud Config 的两个核心组件：Config Server 作为配置中心服务，负责从 Git 等后端读取并提供配置；Config Client 作为微服务消费者，负责从 Server 拉取配置并应用到自身环境。",
    "source": "文档中「配置文件动态刷新的实现机制」-「配置中心与客户端的设计」部分",
    "hint": "思考一下配置的“提供者”和“消费者”分别是谁。"
  },
  {
    "question": "在 Spring Cloud 应用中，使用 `@RefreshScope` 注解的主要目的是什么？",
    "options": [
      "当配置发生变化并触发刷新事件时，它能够使被注解的 Bean 被重新实例化，从而注入新的配置值。",
      "它会自动检测 Git 仓库的变更并拉取最新配置，无需手动触发。",
      "它用于标记一个 Bean 可以从配置中心读取配置，但不支持动态更新。",
      "它将配置信息缓存到本地，以提高应用启动速度。"
    ],
    "correctAnswerIndex": 0,
    "explanation": "`@RefreshScope` 是实现动态配置的关键。当 `/actuator/refresh` 被调用后，Spring 容器会销毁被此注解标记的 Bean，并在下次使用时重新创建一个实例。这个重建过程会使用最新的配置属性，从而实现了配置的动态刷新。",
    "source": "文档中「配置文件动态刷新的实现机制」-「刷新机制的核心组件」部分",
    "hint": "这个注解能够让 Bean 在刷新时“动态重构”。"
  },
  {
    "question": "在不使用 Spring Cloud Bus 的情况下，如何为一个独立的配置客户端（Config Client）手动触发配置刷新？",
    "options": [
      "重启该客户端实例，使其在启动时拉取最新配置。",
      "向 Config Server 的 `/actuator/refresh` 端点发送 POST 请求。",
      "向该客户端实例的 `/actuator/refresh` 端点发送 POST 请求。",
      "客户端会自动轮询 Config Server，无需手动操作。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "文档指出，配置刷新是由客户端的 Actuator `/actuator/refresh` 端点触发的。当这个接口被调用时，客户端的 `ContextRefresher` 会执行刷新逻辑，包括重新从 Config Server 拉取配置并更新 `@RefreshScope` 中的 Bean。",
    "source": "文档中「配置文件动态刷新的实现机制」-「配置刷新触发流程」部分",
    "hint": "刷新操作是针对“客户端”发起的，并且需要调用一个特定的 Actuator 端点。"
  },
  {
    "question": "与手动调用每个服务的刷新接口相比，引入 Spring Cloud Bus 的核心优势是什么？",
    "options": [
      "它提供了一个可视化的界面来管理所有微服务的配置。",
      "它通过消息中间件将刷新事件广播给所有微服务，实现配置的全局自动刷新。",
      "它替代了 Config Server，将配置信息直接存储在消息队列中。",
      "它增强了 `/actuator/refresh` 端点的安全性，防止未授权访问。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "Spring Cloud Bus 的核心价值在于解决集群中多实例的配置同步问题。它利用 RabbitMQ 或 Kafka 等消息中间件，将一个刷新请求（通过调用 `/actuator/bus-refresh`）转化为一个广播事件，通知所有订阅了该事件的微服务实例执行刷新操作，从而避免了手动逐一调用的繁琐和遗漏。",
    "source": "文档中「实现动态刷新的详细步骤」-「使用 Spring Cloud Bus 实现全局刷新」部分",
    "hint": "文档提到，它的目的是“避免手动逐一调用刷新接口”。"
  },
  {
    "question": "当集成了 Spring Cloud Bus 后，为了实现所有微服务的配置同步更新，通常应该调用哪个 API 端点？",
    "options": [
      "POST /actuator/refresh",
      "POST /actuator/bus-refresh",
      "GET /bus/status",
      "POST /config/broadcast"
    ],
    "correctAnswerIndex": 1,
    "explanation": "文档明确指出，当使用 Spring Cloud Bus 时，应调用 `/actuator/bus-refresh` 端点。这个端点会发布一个刷新事件到消息中间件，所有监听此事件的微服务客户端都会接收到并触发各自的刷新流程。而 `/actuator/refresh` 只会刷新被调用的单个实例。",
    "source": "文档中「实现动态刷新的详细步骤」-「使用 Spring Cloud Bus 实现全局刷新」部分",
    "hint": "这个端点名字中包含了 'bus'，用以区别于单个实例的刷新。"
  },
  {
    "question": "为了使 `/actuator/refresh` 端点能够通过 Web 访问，需要在客户端的 `application.yml` 中进行哪项关键配置？",
    "options": [
      "设置 `spring.cloud.config.refresh.enabled: true`",
      "将 `spring.cloud.bus.enabled` 设置为 `true`",
      "在 `management.endpoints.web.exposure.include` 下添加 `refresh`",
      "将 `spring.cloud.config.uri` 指向正确的 Config Server 地址"
    ],
    "correctAnswerIndex": 2,
    "explanation": "为了安全起见，Spring Boot Actuator 的端点默认不全部通过 Web 暴露。要开放 `/actuator/refresh` 端点，必须在客户端的配置文件中，通过 `management.endpoints.web.exposure.include` 属性明确指定要暴露的端点名称。",
    "source": "文档中「实现动态刷新的详细步骤」-「配置文件设置」部分",
    "hint": "查看文档中的 `application.yml` 示例，注意 `management` 下的配置项。"
  },
  {
    "question": "根据文档中的“配置刷新注意事项”，以下哪项描述是正确的？",
    "options": [
      "配置刷新过程非常轻量，对服务性能几乎没有影响。",
      "数据库连接信息这类配置最适合使用动态刷新，可以随时切换数据源。",
      "为了方便，Actuator 的刷新端点应该对公网开放，以便随时更新。",
      "频繁的配置刷新可能因 Bean 重载导致服务短暂性能抖动，应谨慎使用。"
    ],
    "correctAnswerIndex": 3,
    "explanation": "文档在“性能优化”部分特别提醒，配置刷新会触发 Bean 的重新加载。如果 Bean 的依赖关系复杂或初始化耗时较长，这个过程可能会导致服务短暂的性能抖动或响应延迟。因此，需要权衡便利性与稳定性，避免不必要的频繁刷新。",
    "source": "文档中「配置刷新注意事项」-「性能优化」部分",
    "hint": "文档提到了刷新可能带来的一个负面影响，与“性能”和“Bean重新加载”有关。"
  }
];
        console.log("Quiz Data:", JSON.parse(JSON.stringify(quizData))); // 添加这行用于调试，以可展开的JSON格式输出
        
        let currentQuestionIndex = 0;
        let score = 0;
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          optionsListEl.innerHTML = '';
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                    child.style.backgroundColor = '#d4edda';
                    child.style.borderColor = '#c3e6cb';
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                // 如果选错了，高亮错误选项
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            document.getElementById('quiz-footer').style.display = 'none';

            const correctCount = score;
            const totalQuestions = quizData.length;
            const answeredCount = userAnswers.filter(a => a !== null).length;
            const wrongCount = answeredCount - correctCount;
            const skippedCount = totalQuestions - answeredCount;
            const accuracy = totalQuestions > 0 ? Math.round((correctCount / totalQuestions) * 100) : 0;
            const errorRate = totalQuestions > 0 ? Math.round((wrongCount / totalQuestions) * 100) : 0;

            const finalScoreHtml =
                '<div class="final-score-container">' +
                '<h2>答题报告</h2>' +
                '<div class="score-summary">' +
                '<div class="score-card">' +
                '<h3>得分</h3>' +
                '<p>' + correctCount + ' / ' + totalQuestions + '</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>正确率</h3>' +
                '<p>' + accuracy + '%</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>错误率</h3>' +
                '<p>' + errorRate + '%</p>' +
                '</div>' +
                '<div class="score-card score-details">' +
                '<table>' +
                '<tr><td>正确</td><td>' + correctCount + '</td></tr>' +
                '<tr><td>错误</td><td>' + wrongCount + '</td></tr>' +
                '<tr><td>未答</td><td>' + skippedCount + '</td></tr>' +
                '</table>' +
                '</div>' +
                '</div>' +
                '<div class="report-actions">' +
                '<button id="review-btn">回顾测验</button>' +
                '<button class="primary" onclick="location.reload()">再试一次</button>' +
                '</div>' +
                '</div>';

            let reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }
            quizContentEl.insertAdjacentHTML('beforeend', finalScoreHtml);
            document.getElementById('review-btn').addEventListener('click', reviewQuiz);
        }

        function reviewQuiz() {
            const reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }

            document.querySelector('.quiz-body').style.display = 'block';
            document.getElementById('quiz-footer').style.display = 'flex';
            
            currentQuestionIndex = 0;
            loadQuestion();
            updateNavigationButtons(); // Ensure nav buttons are correctly displayed
        }

        // Event Delegation for options
        optionsListEl.addEventListener('click', (event) => {
            if (event.target && event.target.matches('li.option-item')) {
                // Check if the question has already been answered
                if (userAnswers[currentQuestionIndex] === null) {
                    const selectedIndex = parseInt(event.target.dataset.index, 10);
                    selectOption(selectedIndex);
                }
            }
        });

        prevBtn.addEventListener('click', goToPreviousQuestion);
        nextBtn.addEventListener('click', goToNextQuestion);
        hintBtn.addEventListener('click', showHint);
        
        // 初始加载
        loadQuestion();
      </script>
    </body>
    </html>
  